Zimogorov_Arseniy_OrdersManager/StartForm.cs

using System;
using System.Windows.Forms;

namespace WindowsFormsApp4
{
    public partial class StartForm : Form
    {
        public StartForm()
        {
            InitializeComponent();
            AttachEventHandlers();
        }

        private void AttachEventHandlers()
        {
            btnLogin.Click += BtnLogin_Click;
            btnRegister.Click += BtnRegister_Click;
        }

        private void BtnLogin_Click(object sender, EventArgs e)
        {
            LoginForm loginForm = new LoginForm();
            loginForm.Show();
            this.Hide();
        }

        private void BtnRegister_Click(object sender, EventArgs e)
        {
            RegisterForm registerForm = new RegisterForm();
            registerForm.Show();
            this.Hide();
        }

        protected override void OnFormClosing(FormClosingEventArgs e)
        {
            base.OnFormClosing(e);
            if (e.CloseReason == CloseReason.UserClosing)
            {
                Application.Exit();
            }
        }
    }
}